That would be a simple top to bottom flip of the image, right?
Another way to imagine it would be that the home (the individual) is at the top. Each individual personal connection is at the top and below it is all the infrastructure.
The node near my house is in the sky, but as soon as it connects to the internet it's going underground in fiber tubes buried next to the highways that criss-cross the nation and the world.
I suppose that in a pure wifi-mesh system, unconnected to the internet, it could be considered an air only, connected from above, system.
However we look at it, I think it is important that we find a way to impart a meaningful, shared conceptual model of what we're building. Only with a model that people can understand quickly and at a high level will it get traction. We don't want to mislead or pander only to the lowest common denominator but we want it to be right sized, if you will, to our goal of educating the public.
I think, that when we are looking for the balance of high level abstractions to low level technical details, that we should ere a bit on the side of technical. I know I get frustrated with descriptions of technology that use a false abstraction in an attempt to make a challenging idea accessible to those who are unfamiliar with those ideas.
My 4c... ;)